Matrices - revision

Describing matrix:http://www.onlinemathlearning.com/matrices-rows-columns.html
Equality of matices:http://www.onlinemathlearning.com/equal-matrices.html
Types of matrices:http://www.onlinemathlearning.com/matrices-types.html
Addition and Subtraction of matrices:http://www.onlinemathlearning/matrix-addition-subtraction.html
Scalar Multiplication:http://www.onlinemathlearning.com/matrix-scalar-multiplication.html
Multiplication:http://www.onlinemathlearning.com/matrix-multiplication.html
Idebtity matrix:http://www.onlinemathlearning.com/identity-matrix.html
Singular Matrix:http://www.onlinemathlearning.com/singular-matrix.html
Simultaneous Equations:http://www.onlinemathlearning.com/simultaneous-equations-matrices.html
Applications:http://www.onlinemathlearning.com/using-matrices.html